When drink enters the picture, first sexual experiences tend to be riskier and less wanted.

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Originally published on October 19, 2015 3:08 pm

Almost half of teenagers have sex before they graduate from high school. And many high schoolers drink. But drinking can make that first sexual experience less than what a girl might hope, and poses risks for the future, too.

One-quarter of the young women had been drinking at the time of their first sexual intercourse, which happened when they were 16, on average.

Those who had been drinking were more likely to have had sex with someone who wasn't a romantic partner, and with someone who also had been drinking or using drugs. Their partner was also more likely to be older, and to be someone who they didn't have sex with again.

"It's who you're having sex with that's important," says Jennifer Livingston, a senior research scientist at the University at Buffalo, SUNY, and lead author of the study, which was published in the Journal of Adolescence. Having sex with someone older at a party or other social situation is riskier, she says, both physically and emotionally.

The girls who hadn't been drinking were more likely to say that their first sexual experience was more planned, wanted, and satisfying, and were more likely to continue the relationship.

Livingston has been studying sexual assault for years, and got interested in the question of first sexual experiences and drinking because many of the women she interviewed said they had been assaulted as teenagers.

In this study, a woman's first sexual experience was more likely to be coerced if drinking was involved. Eighteen percent said the sex was without consent, compared to 4 percent in those who hadn't been drinking. The girls who had been drinking were more likely to drink, and drink heavily, when having sex in the future.

"There's this misperception that if you drink you're tacitly agreeing to do anything sexual," Livingston says. "I think both men and women have that belief."

So teenagers and young adults should think about what kind of situation they want when they're sexually intimate with someone. "Do you want it to be with someone you trust and who cares about your well-being?" Livingston says. "If that's the case, then you really don't want to have sex in these sorts of drinking situations, and prepare yourself for how you're going to handle it. Because there's an expectation of sexual involvement in these settings."

And parents should think about what their daughters need to know. "We need to do a better job of talking to our girls about sex and making good decisions," Livingston says. "Be careful about drinking. That can kind of sideline you."